> ?harmonic()
Warning message:
In file(out, "wt") :
  无法打开文件'C:\Users\pc\AppData\Local\Temp\RtmpGMawef\Rhttpd1e4426881957': No such file or directory

> ??harmonic()
Warning message:
In file(out, "wt") :
  无法打开文件'C:\Users\pc\AppData\Local\Temp\RtmpGMawef\Rhttpd1e445913256a': No such file or directory

请问是杂么回事呢？